Jurnal Serambi Engineering (Oct 2022)
Peningkatan Parameter Mekanis Tanah Lempung Plastisitas Tinggi sebagai Bahan Timbunan dengan Penambahan Kapur
Abstract
The clay plasticity can be reduced chemically using lime which contains Ca++ and Mg++ to neutralize the swelling and shrinkage properties. The test soil sample from Teluk Mesjid Village, Balangan Regency, has a 51% liquid limit, a 30.45% plastic limit and 20.55 Plastic Index, it is not specified as an embankment material. The lime percentage was based on plasticity test on soil mixed with 4%, 6% and 8% lime. Direct shear and independent compressive strength tests were carried out on the original soil samples and soil samples with addition of 6% lime resulting from standard and modified compaction as well as CBR tests for unsoaked and soaked conditions. The lime addition reduced the Plasticity Index greatly from 20.55% to 5.84% or to low plasticity category. Soil cohesion increased up to 100%. The shear angle increased was only 2-3°. The ultimate bearing capacity of the free compression test from modified compaction increased significantly up to 100%. The increase in CBR value in soaked conditions reached 59.6% to 63%. The soaked CBR value with lime addition increased from 7% to 17.4% or increased for 2.48 times.
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